What is the airport code for Delhi, India?

The airport code for Delhi, India, is DEL. This code is assigned by the International Air Transport Association (IATA) and is used universally to identify Indira Gandhi International Airport, which serves as the primary airport in Delhi. This designation is part of a systematic naming convention where codes are usually based on either the name of the airport or its geographical location.

In contrast, DEN represents Denver International Airport in Colorado, DTW is the code for Detroit Metropolitan Wayne County Airport in Michigan, and DSM corresponds to Des Moines International Airport in Iowa. Thus, DEL is the correct choice, as it uniquely identifies the airport in Delhi, aligning with the standards set by IATA.